Eruptive Stars
Monitoring

 

Recurrent Symbiotic Nova T CrB
(Pre Outburst spectroscopic monitoring: 2022 - 202X)

 

Retour

 

 

Context T CrB belongs to the very small group of recurring novae (RN) and among them the symbiotic sub-group (SyRN).
Its first outburst was detected in 1866 during which Huggins obtained the first spectrum of a nova. The second outburst occurred in 1946, making T CrB a recurring nova.
The system is currently in high state since (increase of the accretion rate toward the disk and the boundary layer)
From a comparison with 1946 event, Brad Sheafer (2019) predicted the next outburst around 2023. But Luna+ (2020) considering the lower activity of the current high state delayed the previson to 2023-2026.
B. Sheafer (2023) revised the previson to. 2025.5 +/- 1.3
Forecast
L+ : Luna+,2020
B : Sheafer, 2019, 2023 		L+: Luna & al. (20202)
B: Brad Sheafer (2019,2023)
blue dot: periastron (B. Sheafer suggests that the outburst could coincide.
triangle: current date
Eruptive Stars Database https://aras-database.github.io/database/tcrb.html
Topic in ARAS Forum http://spectro-aras.com/forum/viewtopic.php?f=36&t=2992&p=17075#p17075
   
 

 

Last Spectrum
   

 

 

AAVSO BVRI Band
 
 
 
 
 

 

Current cycle in dark

The B and V magnitudes (significantly dependant of the luminosity of the hot component) reach the pre high state level.

 

Spectroscopic
Evolution

One of the key feature of the evolution of the sytem during the high state pre-outburst phase is the intensity of He II 4686 line (see e.g. Ielkiewicz+, 2016)

The last spectra show the fast decrease of He II at a time scale of about one month.

 
 
 
 
 

 

 
Orbital Phase: Lines, 1988

 

 

 

 

   
   
   
   

 

 

 

 

 

 

Monitoring:

Spectra T CrB Eruptive Stars Database: https://aras-database.github.io/database/tcrb.html

References:

Schaefer, B. E, MNRAS, 2023 https://arxiv.org/pdf/2303.04933.pdf
Schaefer, B. E, AAS, 2019 https://ui.adsabs.harvard.edu/abs/2019AAS...23412207S/abstract
Luna, G.J.M, Sokoloski J.L., Mukai K., and Kuin, N.P.M, 2020, ApJ https://arxiv.org/pdf/2009.11902.pdf
Iłkiewicz, K., Mikołajewska, J., Stoyanov, K., Manousakis, A., Miszalski, B., MNRAS, 2016 https://ui.adsabs.harvard.edu/abs/2016MNRAS.462.2695I/abstract